pathstepexpression.h

Go to the documentation of this file.

/*
 | Author: Michael Schmidt;
 |         Gunnar Jehl 
 |
 | ************************* SOFTWARE LICENSE AGREEMENT ***********************
 | This source code is published under the BSD License.
 |
 | See file 'LICENSE.txt' that comes with this distribution or
 | http://dbis.informatik.uni-freiburg.de/index.php?project=GCX/license.php
 | for the full license agreement.
 |
 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 | POSSIBILITY OF SUCH DAMAGE.
 | ****************************************************************************
*/

#ifndef PATHSTEPEXPRESSION_H
#define PATHSTEPEXPRESSION_H

#include "expression.h"
#include "pathstepattribute.h"

#define WEIGHT_AXIS_CHILD        1

#define WEIGHT_AXIS_DESCENDANT    3

#define WEIGHT_AXIS_DOS            3

#define WEIGHT_INNER_NODETEST    1

class PathStepExpression:public Expression {

  public:
    PathStepExpression(EXP_TYPE _type, AXIS_TYPE _axis,
                       PathStepAttribute * _attribute);

     virtual ~ PathStepExpression();

    virtual void print(OutputStream & dos) const = 0;

    inline AXIS_TYPE getAxisType() {
        return axis;
    } inline void setAxisType(AXIS_TYPE _axis) {
        axis = _axis;
    }

    NODETEST_TYPE getNodeTestType();

    inline PathStepAttribute *getAttribute() {
        return attribute;
    }

    inline void setAttribute(PathStepAttribute * _attribute) {
        attribute = _attribute;
    }

    unsigned getStepWeight(bool is_last_step);

    inline bool isTagNodeTest() {
        return type == et_pathsteptag;
    }

    inline bool isStarNodeTest() {
        return type == et_pathstepstar;
    }

    inline bool isNodeNodeTest() {
        return type == et_pathstepnode;
    }

    inline bool isTextNodeTest() {
        return type == et_pathsteptext;
    }


    inline bool isDosNodeStep() {
        return axis == at_dos && type == et_pathstepnode;
    }

    bool isSyntacticallyEqualTo(PathStepExpression * ps);

    virtual bool isMatchingTag(TAG tag) = 0;

    inline bool hasAttribute() {
        return attribute != NULL;
    }

    virtual PathStepExpression *clone() = 0;

    virtual PathStepExpression *cloneWithoutAttributes() = 0;

  protected:
    AXIS_TYPE axis;

    PathStepAttribute *attribute;
};

#endif // PATHSTEPEXPRESSION_H

---